Xylem SDI-12 Data Logger iLink - Manual (Page 45)

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iLink - Configuration and Support Utility 45
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Reset
This is the value at which the alarm will be reset.
Alarm Time
This setting applies only to rainfall alarms. It is used to specify the duration over which the total rainfall
must exceed the alarm trigger points. For example, a trigger of 10 (mm) and an Alarm Time of 30
(minutes), indicates that the alarm would be triggered if the rainfall exceeded 10 mm over any 30 minute
period. All rainfall alarms for a sensor are tied to the same Alarm Time.
Call Back
If the Call Back setting is enabled, the logger will automatically call back to the base station (such as
HydroTel 2000) if any alarm for the sensor is triggered. The base station can then unload the logger
and/or take other appropriate action, such as sending text message or pager notification to appropriate
personnel.
6.3.1.12 Output Setup
Any active sensor can be used to provide a variable control output on one of the output channels of the
logger. A typical example of this would be in reading the digital input from an SDI-12 sensor and
outputting this to a PLC as a scaled analogue voltage, which could not directly ‘talk’ to the SDI-12 sensor.
Minimum Value
Specify the minimum value from the sensor that should be converted to a control output. Values below
this will be treated as equal to the minimum.
Maximum Value
Specify the maximum value from the sensor that should be converted to a control output. Values above
this will be treated as equal to the maximum.
Channel
{None, V01, V02, V03}
Select the logger output channel where the control voltage should be applied.
Range
{0 – 1V, 0 – 2V, 0 – 2.5V, 0 – 5V}
Select the range of voltage to be applied to the output channel. The sensor values will be scaled to this
range according to the Minimum and Maximum Values set above.
Value to Use
{Immediate, Last logged Value}
This setting indicates how the output voltages are determined.
Immediate: Each sensor reading results in a corresponding voltage change at the output
channel.
Last Logged Value: The output voltage remains steady at a level based on the last logged value. The
voltage level is changed each time a new value is logged.